A positive pressure smelting industrial electric furnace

Abstract

This utility model discloses a positive pressure smelting industrial electric furnace, relating to the field of smelting equipment technology. The utility model includes a furnace body and a furnace cover. A flue gas treatment component is provided on one side of the top of the furnace cover, and a feeding component is provided on the other side of the top of the furnace cover. The flue gas treatment component includes a combustion cylinder located on one side above the furnace cover. An overflow pipe is fixedly connected to the bottom of the combustion cylinder, and the bottom end of the overflow pipe extends to the upper inner side of the furnace body. This utility model introduces carbon monoxide from the furnace body into the combustion cylinder for combustion through the overflow pipe on the combustion cylinder. The heat generated by the combustion is used to heat the water in the sleeve through heat exchange fins, solving the problem of difficulty in recovering and reusing the waste heat generated by carbon monoxide combustion in existing systems. Simultaneously, the threaded rod in the mounting frame drives the collar and the feeding pipe to rise and fall, ensuring that the discharge end of the feeding pipe is always above the molten pool inside the furnace body, solving the problem of difficulty in preventing some powder from clogging the furnace flue during the feeding process.

Description

Technical Field

[0001] This utility model belongs to the field of smelting equipment technology, and in particular relates to a positive pressure smelting industrial electric furnace. Background Technology

[0002] Smelting is a process of extracting or purifying metals from ores through heating or other chemical or physical methods. It is an important part of metallurgy and is widely used in industrial production and metal material preparation. In the smelting process, electric furnaces are one of the most critical processing equipment. An electric furnace is an industrial equipment that uses electricity as a heat source for metal smelting or material processing and is widely used in the fields of steel, non-ferrous metals, and chemicals.

[0003] Existing industrial electric furnaces mainly consist of a furnace body system, an electrode system, a power supply system, and an auxiliary system. The furnace body system mainly consists of three parts: the furnace bottom, the furnace wall, and the furnace cover. The electrode system consists of two parts: graphite electrodes and an electrode lifting mechanism. The auxiliary system consists of a burner, a dust removal device, an oxygen supply device, and a cooling device.

[0004] However, because existing industrial electric furnaces use dust removal fans or flue gas purification systems that act directly on the furnace body, the reaction atmosphere inside the furnace is always under negative or slightly positive pressure. It is difficult to prevent oxygen in the air from entering the furnace body through the furnace cover, feeding pipe, and other channels to participate in the oxidation-reduction reaction process, affecting the smelting process indicators and parameters. Moreover, the negative pressure atmosphere inside the furnace will cause carbon monoxide to stay in the furnace for too long, resulting in carbon monoxide combustion inside the furnace. This will cause the furnace gas temperature in the carbon monoxide overflow zone to rise, thereby affecting the service life of components such as electrodes, electrode sheaths, pressure rings, conductive elements, and furnace covers. In addition, some powder of the falling mixed material is sucked into the flue by the induced draft fan for combustion, accumulation, and sintering. This will not only cause flue blockage but also cause ore loss, affecting the metal smelting recovery rate and increasing economic costs.

[0005] To address these issues, we provide a positive pressure smelting industrial electric furnace. Utility Model Content

[0006] The purpose of this utility model is to provide a positive pressure smelting industrial electric furnace. Carbon monoxide in the furnace body is introduced into the combustion cylinder through the overflow pipe on the combustion cylinder for combustion. The heat generated by combustion is used to heat the water in the sleeve through heat exchange fins, which solves the problem of difficulty in recovering and reusing the waste heat generated by carbon monoxide combustion. At the same time, the threaded rod in the mounting frame drives the collar and the feeding pipe to rise and fall, so that the discharge end of the feeding pipe is always located above the molten pool in the furnace body, which solves the problem of difficulty in avoiding the blockage of the furnace flue by some powder during the feeding process.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model is a positive pressure smelting industrial electric furnace, including a furnace body and a furnace cover. A flue gas treatment component is provided on one side of the top of the furnace cover, and a material feeding component is provided on the other side of the top of the furnace cover.

[0009] The flue gas treatment assembly includes a combustion cylinder located on one side above the furnace cover. An overflow pipe is fixedly connected to the bottom of the combustion cylinder. The bottom end of the overflow pipe extends to the upper inner side of the furnace body. A sleeve is fitted on the outer wall of the combustion cylinder. Multiple heat exchange plates are evenly spaced inside the combustion cylinder along its axial direction. Both ends of the heat exchange plates extend to the inner side of the sleeve.

[0010] The feeding assembly includes a feeding shell located on the other side above the furnace cover and a sleeve penetrating the surface of the furnace cover. A mounting frame is fixedly connected to the rear end of the other side of the top of the furnace cover. A threaded rod is rotatably connected inside the mounting frame. A slider is threadedly connected to the threaded rod. A collar is fixedly connected to the front end face of the slider. A feeding tube is fixedly penetrating through the surface of the collar. The bottom end of the feeding tube movably penetrates through the sleeve and extends into the interior of the furnace body. A limit plate is fixedly connected to the bottom end of the feeding tube. The top end of the feeding tube is connected to the feeding shell through an expansion joint.

[0011] The present invention is further configured as follows: a slag outlet is provided on the upper part of one side of the outer wall of the furnace body, and a material outlet is provided on the lower part of the other side of the outer wall of the furnace body. The furnace cover is fixedly connected to the top of the furnace body. Multiple electrodes are arranged in a circular array along the axial direction at the center of the surface of the furnace cover. The bottom ends of the electrodes all extend to the inner side of the furnace body. Explosion-proof holes are provided at the front and rear ends of the top of the furnace cover. Sealing plugs are fixedly connected inside the explosion-proof holes.

[0012] A further feature of this invention is that a section of the heat exchange plate located inside the combustion cylinder has multiple ventilation holes evenly provided, and a section of the heat exchange plate located inside the sleeve has multiple fins evenly welded on it.

[0013] A further feature of this invention is that an exhaust pipe is fixedly connected to the top of the combustion chamber, and multiple intake pipes are fixedly connected in a circular array along the axial direction of the bottom outer side of the combustion chamber.

[0014] A further feature of this invention is that a water inlet pipe is fixedly connected to one side of the top of the sleeve, and a water outlet pipe is fixedly connected to the other side of the bottom of the sleeve.

[0015] A further feature of this invention is that a fixing plate is fixedly connected to the other side of the top of the furnace cover, and mounting brackets are fixedly connected to the front and rear ends of the upper surface of the fixing plate, with the upper ends of the mounting brackets fixedly connected to the front and rear ends of the material feeding shell respectively.

[0016] A further feature of this invention is that: a discharge pipe is fixedly connected to one side of the bottom of the material discharge shell, the bottom end of the discharge pipe is fixedly connected to the top end of the telescopic joint, a feed pipe is fixedly connected to the other side of the top of the material discharge shell, a first drive motor is fixedly connected to one side of the outer wall of the material discharge shell via a first motor frame, the output shaft of the first drive motor extends into the interior of the material discharge shell and is fixedly connected to an auger rod, and the end of the auger rod away from the first drive motor is rotatably connected to the other side of the inner wall of the material discharge shell.

[0017] A further feature of this invention is that a second drive motor is fixedly connected to the top of the mounting frame via a second motor bracket, the output shaft of the second drive motor extends to the upper inner side of the mounting frame and is fixedly connected to the top end of the threaded rod, and the bottom end of the threaded rod is rotatably connected to the bottom inner side of the mounting frame.

[0018] This utility model has the following beneficial effects:

[0019] This invention, by setting up a flue gas treatment component, utilizes the positive pressure atmosphere inside the furnace to allow gases such as carbon monoxide to flow naturally into the combustion chamber through the overflow pipe. The igniter inside the combustion chamber then ignites the carbon monoxide and other gases. The heat generated by the combustion of carbon monoxide is transferred to the sleeve through heat exchange fins, thereby heating the water inside the sleeve. This achieves the recovery and reuse of the heat generated by the combustion of carbon monoxide, preventing carbon monoxide from burning inside the furnace and facilitating the recovery and reuse of the heat generated by the combustion of carbon monoxide.

[0020] This invention features a feeding assembly that activates a second drive motor. The output shaft of the second drive motor rotates a threaded rod, which in turn moves a collar and a feeding pipe up and down via a slider. This ensures that the discharge end of the feeding pipe is always positioned above the molten pool inside the furnace, preventing some powder from burning inside the furnace during the feeding process and also preventing some powder from clogging the furnace flue. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 This is a partial sectional view of the furnace body of this utility model.

[0024] Figure 3 This is a structural disassembly diagram of the furnace cover of this utility model.

[0025] Figure 4 This is a partial cross-sectional view of the flue gas treatment component of this utility model.

[0026] Figure 5 This is a schematic diagram of the structure of the heat exchanger plate of this utility model.

[0027] Figure 6 This is a schematic diagram of the material feeding assembly of this utility model.

[0028] Figure 7 This is a partial cross-sectional view of the material feeding shell of this utility model.

[0029] Figure 8 This is a structural disassembly diagram of the mounting frame and feeding pipe of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1-Furnace body, 101-Slag outlet, 102-Material outlet, 2-Furnace cover, 201-Electrode, 202-Explosion-proof hole, 203-Sealing plug, 3-Flue gas treatment assembly, 301-Combustion cylinder, 301a-Overflow pipe, 301b-Gas outlet pipe, 301c-Gas inlet pipe, 302-Sleeve, 302a-Water inlet pipe, 302b-Water outlet pipe, 303-Heat exchange fins, 303a-Ventilation hole, 303b-Fins, 4-Material feeding assembly, 401-Material feeding Shell, 401a-Discharge pipe, 401b-Infeed pipe, 401c-First motor frame, 401d-First drive motor, 401e-Auger rod, 402-Mounting bracket, 402a-Fixing plate, 403-Sleeve, 404-Mounting frame, 404a-Threaded rod, 404b-Second motor frame, 404c-Second drive motor, 405-Collar, 405a-Slider, 406-Feeding pipe, 406a-Limiting plate, 407-Expansion joint. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example

[0033] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, this is the first embodiment of the present invention. This embodiment provides a positive pressure smelting industrial electric furnace, including a furnace body 1 and a furnace cover 2. A flue gas treatment component 3 is provided on one side of the top of the furnace cover 2. The flue gas treatment component 3 includes a combustion cylinder 301, a sleeve 302 and heat exchange plates 303. Carbon monoxide in the furnace body 1 is introduced into the combustion cylinder 301 for combustion through the overflow pipe 301a on the combustion cylinder 301, and the heat generated by combustion is used to heat the water in the sleeve 302 through the heat exchange plates 303. This solves the problem of the difficulty in recovering and reusing the waste heat generated by the combustion of carbon monoxide in the existing system.

[0034] Specifically, the combustion cylinder 301 is located on one side above the furnace cover 2. The bottom of the combustion cylinder 301 is fixedly connected to an overflow pipe 301a, the bottom end of which extends to the upper inner side of the furnace body 1. A sleeve 302 is fitted on the outer wall of the combustion cylinder 301. Multiple heat exchange plates 303 are evenly spaced along the axial direction inside the combustion cylinder 301. Both ends of the heat exchange plates 303 extend to the inner side of the sleeve 302. An igniter is also provided inside the combustion cylinder 301 to ignite the air and carbon monoxide inside the combustion cylinder 301. The combustion cylinder 301 is designed to provide a combustion space for carbon monoxide and prevent the heat generated by the combustion of carbon monoxide from damaging the furnace cover 2 and other structures. The overflow pipe 301a is designed to ensure that the carbon monoxide in the furnace body 1 naturally overflows into the combustion cylinder 301. The sleeve 302 contains clean water to recover and reuse the heat generated by the combustion of carbon monoxide. The heat exchange plates 303 are designed to heat the clean water in the sleeve 302.

[0035] Furthermore, a slag outlet 101 is provided on the upper part of one side of the outer wall of the furnace body 1, and a material outlet 102 is provided on the lower part of the other side of the outer wall of the furnace body 1. An oxygen supply device and a gas circulation system are also provided on the furnace body 1 to ensure that the interior of the furnace body 1 is always under positive pressure. The furnace cover 2 is fixedly connected to the top of the furnace body 1. Multiple electrodes 201 are arranged in a circular array along the axial direction at the center of the surface of the furnace cover 2. The bottom ends of the electrodes 201 extend to the inner side of the furnace body 1. Explosion-proof holes 202 are provided at the front and rear ends of the top of the furnace cover 2. Sealing plugs 203 are fixedly connected inside the explosion-proof holes 202.

[0036] The heat exchange plate 303 located inside the combustion cylinder 301 has a number of ventilation holes 303a evenly provided, and the heat exchange plate 303 located inside the sleeve 302 has a number of fins 303b evenly welded on it.

[0037] The top of the combustion cylinder 301 is fixedly connected to an exhaust pipe 301b, and the bottom outer side of the combustion cylinder 301 is fixedly connected to multiple intake pipes 301c in a circular array along its axial direction.

[0038] A water inlet pipe 302a is fixedly connected to one side of the top of the sleeve 302, and a water outlet pipe 302b is fixedly connected to the other side of the bottom of the sleeve 302.

[0039] The operation process of this embodiment is as follows: Under the action of positive pressure atmosphere in the furnace body 1, the carbon monoxide and other gases in the furnace body 1 flow naturally into the combustion cylinder 301 through the overflow pipe 301a, and the carbon monoxide and other gases are ignited by the igniter in the combustion cylinder 301. The heat generated by the combustion of carbon monoxide is introduced into the sleeve 302 through the heat exchange plate 303, thereby realizing the heating of the clean water in the sleeve 302 and realizing the recovery and reuse of the heat generated by the combustion of carbon monoxide. Example

[0040] Please see Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs from the previous embodiment in that: a feeding assembly 4 is provided on the other side of the top of the furnace cover 2. The feeding assembly 4 includes a feeding shell 401, a sleeve 403, a mounting frame 404, a collar 405, a feeding pipe 406, and a telescopic joint 407. The threaded rod 404a in the mounting frame 404 drives the collar 405 and the feeding pipe 406 to rise and fall, so that the discharge end of the feeding pipe 406 is always located above the molten pool inside the furnace body 1, which solves the problem that it is inconvenient to avoid some powder from clogging the flue of the furnace body 1 during the feeding process.

[0041] Specifically, the feeding shell 401 is located on the other side above the furnace cover 2. The sleeve 403 penetrates the surface of the furnace cover 2. A mounting frame 404 is fixedly connected to the rear end of the other side of the top of the furnace cover 2. A threaded rod 404a is rotatably connected inside the mounting frame 404. A slider 405a is threadedly connected to the threaded rod 404a. A collar 405 is fixedly connected to the front end face of the slider 405a. A feeding pipe 406 is fixedly penetrated through the surface of the collar 405. The bottom end of the feeding pipe 406 movably penetrates the sleeve 403 and extends into the interior of the furnace body 1. A limit plate 406a is fixedly connected to the bottom end of the feeding pipe 406. The top end of the feeding pipe 406 is connected to the feeding shell 401 through a telescopic joint 407. The material discharge shell 401 is used to seal and discharge the raw materials. The sleeve 403 is used to connect the feeding pipe 406 and the furnace cover 2. The mounting frame 404 is used to install the threaded rod 404a and other structures. The threaded rod 404a and the slider 405a are used to drive the collar 405 to rise and fall. The collar 405 is used to drive the feeding pipe 406 to rise and fall. The feeding pipe 406 is used to add the raw materials in the material discharge shell 401 into the furnace body 1. The limiting plate 406a is used to prevent the feeding pipe 406 from moving out of the furnace body 1. The expansion joint 407 is used to connect the feeding pipe 406 and the material discharge shell 401.

[0042] Furthermore, a fixing plate 402a is fixedly connected to the other side of the top of the furnace cover 2. Mounting brackets 402 are fixedly connected to the front and rear ends of the upper surface of the fixing plate 402a. The upper ends of the mounting brackets 402 are fixedly connected to the front and rear ends of the unloading shell 401 respectively.

[0043] A discharge pipe 401a is fixedly connected to one side of the bottom of the discharge shell 401. The bottom end of the discharge pipe 401a is fixedly connected to the top end of the expansion joint 407. A feed pipe 401b is fixedly connected to the other side of the top of the discharge shell 401.

[0044] A first drive motor 401d is fixedly connected to one outer wall of the material discharge shell 401 via a first motor frame 401c. The output shaft of the first drive motor 401d extends into the interior of the material discharge shell 401 and is fixedly connected to an auger rod 401e. One end of the auger rod 401e away from the first drive motor 401d is rotatably connected to the other inner wall of the material discharge shell 401.

[0045] The top of the mounting frame 404 is fixedly connected to the second drive motor 404c via the second motor bracket 404b. The output shaft of the second drive motor 404c extends to the upper inner side of the mounting frame 404 and is fixedly connected to the top end of the threaded rod 404a. The bottom end of the threaded rod 404a is rotatably connected to the bottom inner side of the mounting frame 404.

[0046] The rest of the structure is the same as in Embodiment 1. In addition, depending on the actual needs, the feeding component 4 can be set to three or more sets, and the three or more sets of feeding components 4 are distributed in a circular array with equal spacing on the furnace cover 2.

[0047] The operation process of this embodiment is as follows: The second drive motor 404c is started. The output shaft of the second drive motor 404c drives the threaded rod 404a to rotate. The threaded rod 404a drives the collar 405 and the feeding pipe 406 to rise and fall through the slider 405a, so that the discharge end of the feeding pipe 406 is always above the molten pool inside the furnace body 1. The first drive motor 401d is started. The output shaft of the first drive motor 401d drives the auger rod 401e to rotate, so that the material in the feed shell 401 is transported into the feeding pipe 406 through the auger rod 401e. Finally, the material is added into the furnace body 1 for heating through the feeding pipe 406.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A positive pressure smelting industrial electric furnace, comprising a furnace body (1) and a furnace cover (2), characterized in that: A flue gas treatment component (3) is provided on one side of the top of the furnace cover (2), and a feeding component (4) is provided on the other side of the top of the furnace cover (2). The flue gas treatment assembly (3) includes a combustion cylinder (301) located on one side above the furnace cover (2), and an overflow pipe (301a) is fixedly connected to the bottom of the combustion cylinder (301). The bottom end of the overflow pipe (301a) extends to the upper inner side of the furnace body (1), and a sleeve (302) is fitted on the outer wall of the combustion cylinder (301). Multiple heat exchange plates (303) are evenly spaced inside the combustion cylinder (301) along its axial direction, and both ends of the heat exchange plates (303) extend to the inner side of the sleeve (302). The feeding assembly (4) includes a feeding shell (401) located on the other side above the furnace cover (2) and a sleeve (403) penetrating the surface of the furnace cover (2). A mounting frame (404) is fixedly connected to the rear end of the other side of the top of the furnace cover (2). A threaded rod (404a) is rotatably connected inside the mounting frame (404), and a slider (405a) is threadedly connected to the threaded rod (404a). A collar (405) is fixedly connected to the front end face of the slider (405a), and a feeding pipe (406) is fixedly penetrating the surface of the collar (405). The bottom end of the feeding pipe (406) movably penetrates the sleeve (403) and extends into the interior of the furnace body (1). A limiting plate (406a) is fixedly connected to the bottom end of the feeding pipe (406), and the top end of the feeding pipe (406) is connected to the feeding shell (401) through a telescopic joint (407).

2. The positive pressure smelting industrial electric furnace according to claim 1, characterized in that, A slag outlet (101) is provided on the upper part of one side of the outer wall of the furnace body (1), and a discharge outlet (102) is provided on the lower part of the other side of the outer wall of the furnace body (1). The furnace cover (2) is fixedly connected to the top of the furnace body (1), and multiple electrodes (201) are arranged in a circular array along its axis at the center of the surface of the furnace cover (2). The bottom ends of the electrodes (201) extend to the inner side of the furnace body (1), and explosion-proof holes (202) are provided at the front and rear ends of the top of the furnace cover (2). A sealing plug (203) is fixedly connected inside the explosion-proof holes (202).

3. The positive pressure smelting industrial electric furnace according to claim 1, characterized in that, The heat exchange plate (303) has a number of ventilation holes (303a) evenly opened on the section inside the combustion cylinder (301), and a number of fins (303b) are evenly welded on the section inside the sleeve (302) of the heat exchange plate (303).

4. The positive pressure smelting industrial electric furnace according to claim 3, characterized in that, The top of the combustion cylinder (301) is fixedly connected to an exhaust pipe (301b), and the bottom outer side of the combustion cylinder (301) is fixedly connected to multiple intake pipes (301c) in a circular array along its axial direction.

5. The positive pressure smelting industrial electric furnace according to claim 3, characterized in that, The top side of the sleeve (302) is fixedly connected to a water inlet pipe (302a), and the bottom side of the sleeve (302) is fixedly connected to a water outlet pipe (302b).

6. The positive pressure smelting industrial electric furnace according to claim 1, characterized in that, A fixing plate (402a) is fixedly connected to the other side of the top of the furnace cover (2), and mounting brackets (402) are fixedly connected to the front and rear ends of the upper surface of the fixing plate (402a). The upper ends of the mounting brackets (402) are fixedly connected to the front and rear ends of the feed shell (401).

7. The positive pressure smelting industrial electric furnace according to claim 1, characterized in that, The bottom side of the feed shell (401) is fixedly connected to the discharge pipe (401a), and the bottom end of the discharge pipe (401a) is fixedly connected to the top end of the telescopic joint (407). The top side of the feed shell (401) is fixedly connected to the feed pipe (401b), and a first drive motor (401d) is fixedly connected to the outer wall of one side of the feed shell (401) through a first motor frame (401c). The output shaft of the first drive motor (401d) extends into the interior of the feed shell (401) and is fixedly connected to an auger rod (401e). The end of the auger rod (401e) away from the first drive motor (401d) is rotatably connected to the inner wall of the other side of the feed shell (401).

8. The positive pressure smelting industrial electric furnace according to claim 1, characterized in that, The top of the mounting frame (404) is fixedly connected to the second drive motor (404c) via the second motor frame (404b), and the output shaft of the second drive motor (404c) extends to the upper inner side of the mounting frame (404) and is fixedly connected to the top end of the threaded rod (404a). The bottom end of the threaded rod (404a) is rotatably connected to the bottom inner side of the mounting frame (404).

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